A Combined Experimental and Theoretical Study on the Formation of Ag Filaments on beta-Ag2MoO4 Induced by Electron Irradiation

Autor(es)

Andres, Juan ^[1] ; Ferrer, Mateus M. ^[2] ; Gracia, Lourdes ^{[1, 3]} ; Beltran, Armando ^[1] ; Longo, Valeria M. ^[4] ; Cruvinel, Guilherme H. ^[4] ; Tranquilin, Ricardo L. ^[2] ; Longo, Elson ^[3]

Afiliação do(s) autor(es)

^[1] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain

^[2] Univ Fed Sao Carlos, INCTMN UFSCar, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Estadual Paulista, INCTMN UNESP, BR-14801907 Araraquara, SP - Brazil

^[4] Univ Sao Paulo, Inst Fis Sao Carlos, INCTMN USP, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION; v. 32, n. 6, p. 646-651, JUN 2015.
• Citações Web of Science: 22

Resumo

A combined experimental and theoretical study is presented to understand the novel observed nucleation and early evolution of Ag filaments on beta-Ag2MoO 4 crystals, driven by an accelerated electron beam from an electronic microscope under high vacuum. The growth process, chemical composition, and the element distribution in these filaments are analyzed in depth at the nanoscale level using field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) with energy-dispersive spectroscopy (EDS) characterization. To complement experimental results, chemical stability, structural and electronic aspects have been studied systematically using first-principles electronic structure theory within a quantum theory of atoms in molecules (QTAIM) framework. The Ag nucleation and formation on beta-Ag2MoO4 are a result of structural and electronic changes of the AgO4 tetrahedral cluster as a constituent building block of beta-Ag2MoO4, consistent with Ag metallic formation. The formation of Ag fi lament transforms the beta-Ag2MoO4 semiconductor from n- to p-type concomitant with the appearance of Ag defects. (AU)

• Processo FAPESP: 12/14468-1 - Desenvolvimento e Interpretação Teórica e Experimental do Sistema BaZrO3@ZnS
• Beneficiário: Mateus Meneghetti Ferrer
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs